Milling machine



July 5, 1949. C. J; EVANS 2,475,227

MILLING MACHINE Filed Oct. 9, 1946 l i F76 g INVENTOR. Y CMRENCEJ VH/v5 7' TOR/VB YS Patented July 5, 1949 UNITED s'rAfr Es PATE N1: oer-*LCE olreeemE-vans, eleteiaamdilff Applicatonfctoher 9, 1946, Serial No. 702.33%

meenam" This inventn relates "Cd 'hllin'gmachlns' more" particularly, to anl improved and" siplid form' of mining' apparatus.' o

Ah'()bjf-:ct` of thinventih'ls toplvi a n'oVe'l and mproved'mlling machine of eiitreinely'sim'- ple and inexpensive'construction for performing" Various "light diltymllli'rrg operations incluling that `of' cutting ke'yWays' and oth'r' longitudinal-grooves in workniee's.

Anlhr Object O'f Ehinvet' is` t0 DIOVd a novel and improved millingv machine" cfcn'neri's` ing a' Awoody member; in which a foftatable'shft and'fmiuing' cutter are j 'rfiaied with` the axis oi the" cutter extending" transversely 'oi' the aiis of" the shaft; the shaft' carrying iileans" directly c'operating with the cutter tdltate the latter fther object' of thel'vitdr isthep'rcvision f a novel and improved mllihgna'chne comprising a lcldyv rernbei iii which' a rotatable shaft" arid: ai tothed" Iriillln cutter' ar' 'dlatably' jurnaied, thegshaft being" prtvided' with means cobjerating Withthe teeth vlof the cutte't'o' r't'ate theliatte'r.

A" stm furtherl object or the invention' is the provision of a novel iijillingr attachment' for'u's with a' machine tool havnga rotatable spindle, the attachment comprising a bbdyflember in which a shaft and 'a milling cutter are'jrnalecl for rotation',y the shaft being'adapted't'o benonrlected with the spindle' of the' machirlet'ol to be' supported and' rtaed'ltherby to" drh/"e the milling' c iitter, and the'body merberhing pro'- vi'cled with means to prevent it from rotating;

Ai-adtlonalol'ject ofrtheinvjentionis to proviiela novelmilling attachmentlor a drill press or the like -haVinga-rtatablespindle, the attachment'c'mpr-ising `af-lody member in which a'shaft ah'dmll'ingcutter are journaldfor rtation'with the' axis* of the cutter extending transversely' of the axisr of the sha-it, thejshaft being adapted to be suiporteca'nd"rtatedby the sp'inle'of the drill press and herring'y Iea'ns directly cooperatig' With'the cutterl to rotate tle'hlattg. and the bodymembel b'etg prbifdedwth 'eans tie'- vent rotation of the lattr when! the"A shaft' is rotated. y

2*' otherrnchi' [titoli Having-a i rotatableV spindle, theattacmae eigdffthetypedeseribedin the twou preceding dbjje'ts" and theJ bodyv member thereoreineprevidedfwitrii'det'ehame 'means for cooperation Winrar; pr 'itusly 'mined groeve or olf-arr adapter to ideate Fig. 3 is a sectional View through the novel milling attachment taken on the lino 3-3 oi Fig. 2 and looking in the direction indicated by the arrows;

Fig. 4 is a bottom elevational view of the shaft of the improved milling attachment showing the means thereon for effecting rotation of the cutter;

Fig. 5 is a sectional View taken substantially on the line 5 5 o f Fig. 2 and looking in the direction indicated by the arrows;

Fig. 6 is a top elevational view of a portion of a workpiece provided with a novel adapter or bushing which is employed with the milling attachment when the opening in the workpiece to be milled is larger than the body of the milling attachment;

Fig. 7 is a sectional view taken substantially on the line -'I of Fig. 6 and looking in the direction indicated by the arrows;

Fig. 8 is a top elevational View of a portion of a workpiece having a tapered opening and provided with a modied form of adapter or bushing which is employed therewith when the novel milling attachment is to be employed to cut a groove in the side of tapered opening; and,

Fig. 9 is a sectional view taken on the line 9 9 of Fig. 8, looking in the direction indicated by the arrows, and also showing, in dot-dash lines, a jig employed with the workpiece and bushing of Fig. 8.

As shown in Fig, 1 of the drawings, one embodiment of a milling `machine constructed in accordance with the invention comprises an upright frame, generally designated I il, having a pair of spaced, forwardly extending arms or brackets II and I2 and a vertically extending member i3, only a portion of the latter being here illustrated, the remainder thereof and the base of the machine being broken away. It will be understood, however, that the base of the machine may be a pedestal or other known type of support and provided with a work table, upon which is a workpiece such as W may be placed for effecting a milling operation thereon. The brackets or arms II and I2 of the frame Ii) are provided with vertically aligned openings in which a spindle Il! is mounted for rotation and reciprocation. Rotation of the spindle Ill can be effected by means of a pulley I5, which is slidably keyed to the spindle and is driven by a belt or similar driving means I6 extending through an opening in the upper bracket member l I of the frame and trained about the pulley on a motor or other driving means not shown.

The spindle I4 extends through an axially movable sleeve Il, the spindle being journaled in the sleeve and supported for axial movement therewith. The sleeve I7 extends through the opening in the bracket I2 and cooperates therewith, as by means of a key or similar expedient, for axial movement therein without rotation. For the purpose of reciprocating the sleeve and the spindle, the yformer is provided with rack teeth i8 cooperating with a pinion, not shown, which is supported and rotated by a shaft I9 journaled in the bracket I2. The outer end of the shaft IS is provided with a pinion 20 which meshes with a toothed sector 2| carried by the bifurcated end 22 of a handle 23, the bifurcated member 22 straddling the pinion 20 and being rotatably supported upon the shaft I9. It will be apparent that when the handle 23 is rocked about the shaft I9, the sector ZI carried thereby will rotate the pinion 20 and shaft I9 thereby axially moving the sleeve I'I and the spindle I4.

The lower end of the spindle IIS, below the bracket I2, is provided. with a suitable chuck, generally designated 211, which may be of any conventional type for gripping and rotating a cylindrical shaft or the like. As shown in Fig. 1, a shaft 25 is positioned in the chuck and is supported and rotated thereby. The shaft 25 is rotatably journaled in a longitudinally extending bore provided in a carrier or body member 26 and eccen-trically disposed with respect to the axis of the latter. As will be seen from Fig. 2, the inner or lower end of the shaft is provided with an enlarged portion 27, which may be formed integrally therewith or secured thereto. The reduced portion of the shaft 25 above the enlarged portion 2l is rotatably received in a sleeve member 28 provided with a threaded section 29 adjacent its upper end cooperating with a corre spending threaded portion of the bore in the body Amember 25. The outer end of the sleeve 28 is `formed as an enlarged boss or collar 3i] which may be provided with a plurality of openings, such as SSI, for receiving a spanner wrench or other tool for threading the sleeve into the carrier or body member to thereby adjust the position of the enlarged portion 21 of shaft 25 for a purpose which will hereinafter become apparent. A lock nut 32 is provided upon the threaded portion 29 of the sleeve for cooperation of the body member 25 to lock the sleeve when the latter has been threaded within the bore of the body member to position the enlarged portion 2'! of the shaft at a desired point. A collar 33 provided with a set screw 3ft is fitted over the upper end of the shaft 25 to retain the latter against axial movement relative to the sleeve 28.

The carrier or body member 2t is preferably substantially cylindrical, and its lower end is axially slotted, as at 35, for receiving a toothed milling cutter 36, the latter being rotatably journaled within the slot of the body member by a short shaft 3l. It will be noted that the axis of the shaft 31 is located to one side of the center of the body member 26 so that the teeth of the milling cutter S6 project exteriorly of the body member on only one side thereof. As will be seen from Fig. 2, the enlarged portion 2l on the shaft 25 terminates closely adjacent the teeth of the milling cutter 3E, and the lower face of the portion ,2l is provided with plurality of spaced nibs of the projections 33 adapted to cooperate with the teeth of the milling cutter in the nature of a pinion, the proper location of the nibs 38 for this purpose being effected by the previously described adjustment of sleeve 28. Hence, when the shaft 25 is rotated, the projections 33 will cause the milling cutter 36 to rotate. While projecting nibs cooperating with the teeth of the cutter have been shown as a mea-ns for effecting a drive between the shaft E5 and the milling cutter 36, it will be readily apparent that other means may be employed for effecting this drive.

The outer face of the body member 2G is provided with a hat surface 39, aligned with the projecting portion of the toothed cutter 36, to accommodate chips formed during operation of the cutter. The body member 26 is also provided with means cooperating with the frame It to prevent rotation of the body member when the shaft 25 is rotated by the spindle I4. In the present instance this means is shown as comprising a clamp member 40 secured to the maar 5. upper end of the body member and extending radially therefrom. Theout'er end of theclamp member is split and provided with an opening for receiving a removable extension rod lll adapted to abut-a portion of the vertical member i3 of the frame.l The vrod 4l' isv held inv place in the clamp it by a clamping screw 42 which draws the two sections of the split portionof clamp together', thus firmly gripping-fred lll. The rod al may be removed and'positioned in either of a pair of vertical opening'sgl ini the split portion of the clamp member' if it' be desired that the rod cooperate withl a hoi' ontal projection, such as the bracket f2' ofthe"i traine, rather than with the vertical member I3;

The apparatus thus far described is employed as follows. Assuming that' alwrkpiece W has an opening iid' therein which-it is desiredI to provide with a keyway" or longitudinally extending groove and that this workpiece has been sup- .l

ported directly below the' body member 26' with the opening :la in alignment therewith. The spindle lll, being rotated by the beltr lli, will rotate the shaft 25, and the nibs orA projections E@ on the lower end oithe' latter cooperate with the l space provided by the flattenedv surface 39 on the body member 2li. When the groove or keyway has been completed, the operator will rock the handle 'i3 in the reverse direction, thereby elevating the mechanism' to remove the body member 26 and the milling cutter'from engagement with the work.

The body member 2li may be provided with a longitudinally extending recess d6 (see Figs. 3 and in the outer surface thereof at substantially 90 about the periphery of the body membei* trom the slotted opening 35 in which the cutter is positioned. This recess all' is adapted to receive a longitudinally extending projection or key de, which may be secured to the body memberA by suitable means such as a screw lill. This projection or key is adapted to be used with a workpiece having a keywayor groove previously formed therein when it is desired to form a second keyway or groove in thev same workpiece but angularly displaced substantially 90 from the 'First keyway. For example; if the workpiece V7, as shown in Fig. l, be provided with a previously formed keyway, such as 50i, a second keywav, such as d5, may be formed at substantially 96 from the keyway 5t by attaching the key or projection lil to the body member 26 and employing the said key inl conjunction with the keyway all to locate and guide the body member .26 during the milling of the' keyway or groove d5.

The exterior oi the' body member 25 may also be provided with a second longitudinally extending recess 5l which is aligned with, and extends upwardly from, the portion of the slotted opening at the rear of the'mlling'cutter, and within the recess 5l body member 26' may be provided with a threaded opening 52. This recess lil and threaded opening 52 enable the key or projection i8 to be attached', to the body lmember at the rear of the cutter'SG when it is', desired Asl the operator conto form a second keyway in a workpiece atsb= stantially 180 from a previously formed'keywa'y or groove. Hence, by employing themilling mai-'- chine here described first without the key oiprojection ll8- and then with the said projection or key attached to the body member, a plurality of keyways or longitudinally' extending grooves may be formed in a workpiece in predetermined angular relationship with respect'to each other'. While the projection or key dS' has been shown as attachable to the body member 26 in positions displaced or 180"l withV respectto the cutter, it will be apparent that these angles are" net critical and the body member maybe pro ided with suitable recesses and threaded openings in other angular relation with respect to the position of the milling cutter if desired;` Moreover, the projection or key may be securedA to the body member by other means. The' body member 276 may also be provided with one or'r-nore oilI holes 53 or other means for lubricatih oithesha-it;

While the milling machine of this inventi'n has heretofore been described as a complete Chine including a driving means for rotating the milling cutter and for feeding the'v latter relative to the workpiece, it will be apparent that the iii-- vention further resides in a milling attachment per se which may be employ-idw th al conventional machine tool having a rotatable spindle; means for connecting a shaft thereto'aiidaI means for producing a relative feeding-v movement b`e tween the spindle and a workpiece. Morelspeeii'# ically, this invention contemplates that a drill press or similar machine tool may be converted into a milling machine by employing therewith, as an attachment, the novel ini-lling' device, which is illustrated per se in Fig. 2. Asa matter of fact, the apparatus illustrated init-ig. 15 may be aeenventional drill press with theshait' 25 supported and rotated by the chuck thereof, the projection rod 4l cooperating with a portion oit'lic frame of the drill press to prevent rotation of the body member 2B when the shaft 25 oi the milling attachment is rotated. I-Ienceyby the provision ol such an attachment, any machine Shop can be readily equipped to performliglit duty milling op:- erations and to mill keyways or similar gro in workpieces without the'nec'essity ofv providing a cumbersome and expensive special Referring now to Figs. 6 and 7, there is 'shown therein an adapter or bushingA for use with the milling machine or attachment previously described when the workpiece in which the longitudinal groove is to be formed has opening larger than, or differing in configuration from; the outer periphery of the lower endoi the body member 26. The specific adapter or bushing til illustrated in Figs. 6 and 'l is adapted for use in a cylindrical opening of a workpiece' W and the said bushing or adapter 5a therefore nas a cylindrical configuration with a diariie'tei substantially equal to the diameter' of'y the o ing in the workpiece W". The bushing-orada'ptei ed is provided with a longitudinally extending bore 55, eccentrically disposed withres'p'ect to theaiis of the adapter, and having a diameter for slidingly receiving the body membery 2t' oithe milling machine or attachment.` A longitudinally extending slot or opening 56 inthe side wallet the adapter 54 communicates with the bore til-iv 'and affords an opening through which the teeth-ortho milling cutter 3G may project for engagement with the workpiece. The uppe'ren'cl oi' thea'daptler or bushing 513 is preferablyp'ro dedl enlarged collar 5l forcoopertioii witi'v-the'l'tp surface of the workpiece W' to retain the bushing therein. If desired, the bore 55 of the adapter may be provided with a longitudinally extending keyway 58 for reception of the key llt on the body member 26 to guide and locate the latter when the adapter or bushing is employed. The operation of the milling machine or attachment, when using such an adapter, is otherwise the same as previously described and hence the description will not be repeated.

If the workpiece, such as W, has a tapered opening therein which is to be provided with a keyway or similar longitudinally extending groove, an adapter or bushing similar to that shown in Figs. 8 and 9 may be employed with the milling machine or attachment. It will be noted that the bushing or adapter 55, in such a case is substantially truste-conical in shape and has an inclined eccentrically disposed opening to therein in which the body member 26 of the mill- .I

ing attachment may be slidingly received. The axis of the opening ll has an angle of inclination substantially equal to the angle between the side wall of the adapter and its base and a portion of the inclined opening 60 intersects a portion of the side wall of the adapter to provide an opening through which the milling cutter may project into engagement with the workpiece W. The opening or bore 6o in the adapter 5e may be provided with a keyway, such as 6|, for receiving a key 1&8 attached to the body member 2S to locate and guide the latter as it is moved within the adapter during a milling operation.

Since the milling machine or attachment, as

here disclosed, is intended to be fed relative to O the work in a vertical direction, and since the opening in the workpiece W" is inclined to the vertical, it is necessary to support the said workpiece W upon a suitable sloping supporting surface of a jig 62 or the like, whose slope is such as to dispose the opening lill in the adapter 59 with its axis extending vertically. Hence, when the body member 25 of the milling machine or attachment is inserted within the opening ttl, it may move freely therethrough in a vertical direction, and the teeth of the cutter 36 will extend through the opening in the side of the adapter 59 to mill a keyway or groove in the side wall oi the inclined opening of the workpiece W.

While only certain types of adapters or bushings have here been disclosed, it will be readily apparent that the improved milling machine or attachment is not limited to use with the specific bushings or adapters disclosed but may be employed with any adapter having an opening in which the body member 26 of the milling machine may slide, and through the side of which the milling cutters 36 may project into engagement with the workpiece, the bushing or adapter having an external configuration substantially corresponding to the conguration of the opening in a workpiece in which the milling operation is to be performed.

While the present preferred embodiment of the novel and improved milling machine and its use as an attachment in a drill press or the like have been disclosed in considerable detail, and while certain specific forms of bushings or adapters have been disclosed for use with the improved milling machine or attachment, it will, of course, be understood that numerous changes and modiiications may be made in the milling machine or the bushings for use therein; and hence, the invention is not to be considered as limited to the exact constructions illustrated and described but includes all modications and equivalents coming within the spirit and scope of the appended claims.

Having thus described my invention, I claim:

1. A milling attachment adapted to be supported and operated by a rotatable spindle of a machine tool, the attachment comprising a cylindrical body member having a longitudinally extending bore therein and a radially extending slotted opening communicating with said bore, a shaft rotatably journaled in said bore and having a portion extending exteriorly thereof for connection with the spindle of the machine tool, means to prevent axial displacement of the shaft relative to the body member, a milling cutter rotatably mounted in the said slotted opening with a portion of the cutter extending exteriorly of the body member, means carried by said shaft for rotating the cutter, the lower end of said body member being adapted to be inserted into a bore in a workpiece to mill a longitudinally extending groove therein, and means on said body member angularly disposed thereabout with respect to the exteriorly extending portion of said cutter for locating and securing a longitudinally extending projection to the body member for cooperation with a groove milled in said workpiece, or with a keyway in an adapter cooperating with said attachment and workpiece, to locate and guide the cutter in predetermined angular relationship thereto.

2. A milling attachment adapted to be supported and operated by a rotatable spindle of a machine tool, the attachment comprising a cylindrical 4body having a longitudinally extending bore therein, a shaft rotatably journalled in said bore and having a portion extending exteriorly thereof for connection with the spindle of the machine tool, means to prevent axial displacement of said shaft relative to the body member, a milling cutter rotatably mounted in a slotted opening extending axially of said body member with a portion of the cutter extending exteriorly of the body member, means carried by said shaft for engaging and rotating said cutter, the lower end of the cylindrical body member being adapted to be inserted into an opening in the workpiece for milling a longitudinally extending groove therein when said cutter is rotated, means to prevent rotation of said body member when the shaft and cutter are rotated, and a longitudinally extending key detachably secured to said body member at a location angularly disposed about the periphery of said body member from said exteriorly extending portion of the cutter, the said key cooperating with a previously formed longitudinally extending groove in an opening of the workpiece into which the body member is inserted for locating and guiding the latter and hence the cutter so that the latter is adapted to mill a second longitudinally extending groove in predetermined angular relationship to said iirst groove.

3. A milling attachment adapted to be supported and operated by a rotatable spindle of a machine tool, the attachment comprising a substantlally cylindrical body member having an axially extending slot adjacent one end, a toothed cutter rotatably journalled in said slot with a portion of the cutter extending outwardly of the slot to perform a milling operation on a Workpiece, the said body member having a longitudinal bore extending therethrough with the lower end of said bore communicating with the said slot, a sleeve having a portion extending into said bore, a shaft rotatably journalled in saidV sleeve and having an integral' enlarged portion at its inner end engaging the corresponding end of said sleeve, a collar secured to said shaft and cooperating with the outer end of said sleeve. a group of axially extending projections carried by the said enlarged portion of the shaft and drivingly cooperating with the teeth of said cutter, the said shaft being adapted to be connected with the spindle of a machine tool to be supported and rotated thereby, means to prevent rotation of said body member, and means to adjust the said sleeve longitudinally within said bore thereby adjusting the said shaft and its axially extending projections relative to the cutter whereby the said projections on the shaft may be brought into proper cooperative engagement with cutters of different diameters.

4. A milling attachment adapted to be supported and operated by a rotatable spindle of a machine tool, the attachment comprising a substantially cylindrical body member having an axially extending slot adjacent one end, a toothed cutter rotatably journalled in the said slot with a portion of the cutter extending outwardly of the slot to perform a milling operation on a workpiece, the said body member having a bore extending longitudinally eccentrically through the body member with the lower end of said bore communicating with the slot, a portion of said bore being provided with a screw thread, a sleeve having a portion extending into said bore and provided with an external screw thread cooperat- 10 ing with the thread in said bore, a shaft rotatably journalled in said sleeve and having an integral enlarged portion at its inner end 'engaging the corresponding end of said sleeve,` a Icollar secured to said shaft and cooperating with the outer end of said sleeve, the outer end of said shaft being adapted to be connected with the spindle of the machine tool to be supported and rotated thereby, means to prevent rotation of said body member, a group of axially extending projections carried by the said enlarged portion of the shaft and drivingly cooperating with the teeth of said cutter, the said cooperating threads on the sleeve and in the saidbore permitting longitudinal adjustment of the sleeve and shaft relative to the cutter whereby the said projections on the shaft may be brought into proper cooperative engagement with cutters of different diameters.

CLARENCE J. EVANS.

REFERENCES CITED The following references are of record in the ille of this patent:

UNITED STATES PATENTS Number Name Date '795,420 Schellenbach July 25, 1905 824,322 Wilner et al June 26, 1906 FOREIGN PATENTS Number Country Date 376,756 Germany June 4, 1923 

